I always have really heavy long, late periods.. And my cramps are really bad. But last month, July, I had it for 16 days. At first it wasnt very heavy. And now im late again and my boobs are really sore and kinda swollen and I have such bad cramps. But no period.. My sis says the boobs are because I have been with ny baby nephew for a week and he breastfeeds and my body thinks I should do it ... Not sure but it can happen even if ive never had a kid.. Im 14 and the doctors said that im fine.. My sister has polycystic ovaries and mum had endometriosis. What should I do...